Only firefox executing mysql query two times. but other browser works perfect why?

i am a web developer. and i am facing a problem only with firefox. every time i use MySQL query in my php code fire fox execute it two times. but same query is working fine on other browsers.

Yes, the problem is seen without extensions and also in safe mode.
But, I am starting to think that firefox is running low on memeory or CPU.
Without extensions the possibility of failing is 1 in 3.
I am still unable to explain why closing the browser or aborting the request can cause the stuck request to immediately reach the server.
Is there a way to collect Firefox logs and post it here ?

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